The hot spring deposits at Mammoth Hot Springs, Yellowstone National Park, are travertine. What rock probably lies somewhere beneath the hot springs?
Which common, rock-forming mineral or mineral group is most readily dissolved by groundwater?
Water-saturated muds have low permeabilities but can have greater porosities than well-cemented sandstone.
Permeability is the physical force that pushes water below the water table through a porous, rock material.
When the elevation of the water table is higher than the level of the surface of a stream, you have a __________.
An unconfined water table is the ________.
boundary between the aerated zone above and saturated zone below
________ are specific features of karst topography.
Streams flowing into depressions and continuing underground
Porosity is a measure of the volume of open space in rocks and unconsolidated, geological materials like alluvium and soils.
An artesian well is one in which ________.
water rises above the top of the aquifer without any pumping
Excessive groundwater withdrawals can cause ________.
the water table to drop or decline in elevation
Which one of the following concerning stalactites and stalagmites is not true?
Stalagmites form on the floors of caves below the water table.
________ would have the largest capacity to naturally remove sewage pollutants.
Slightly clayey sand
________ controls the ease (or difficulty) of groundwater transmission through a porous material.
Which one of the following statements is true for an artesian aquifer?
The water table in the recharge area is at a higher elevation than the top of the aquifer in the subsurface.
In areas underlain by unconsolidated or weakly consolidated strata, lowering of the water table can cause the land to subside.
In general, contaminated groundwater will be naturally cleaned faster by circulation through porous and permeable sands than by circulation through fractured, crystalline igneous and metamorphic rocks.